- In ArtifactSetVersionTest the method was declared,
but not used at all.
- In MtaUtilsTest there was a particular Object created
for the sole purpose of serving as script.
For that we have the nullScript.
- In DockerArtifactVersioningTest 'this' was configured to
serve as script. There is basically no reason why the
instance of the JUnitTest should serve as script.
Instead we have the nullScript for that purpose.
read yaml rule is a very frequently used rule. But having the rule in the common rules
means we cannot register text or files to that rule, which makes it less handy to work
with yaml files in the tests.
